Biology (11th Edition)

Chapter 22 - The Origin of Species - Review Questions - Understand: 7

Answer

D.

Work Step by Step

Allopolypoidy involves an infertile hybrid regaining fertility by a spontaneous doubling of its chromosomes, which also reproductively isolates it from the two parent species (D.). Contrary to A., it is quick, and contrary to C. it leads to more, not fewer, chromosomes. B. is wrong because it is not common in birds but, rather, in plants.